Dodge Durango (HB). Manual — part 895
P0533-A/C PRESSURE SENSOR CIRCUIT HIGH (CONTINUED)
4.
(C18) A/C PRESSURE SIGNAL CIRCUIT OPEN
Turn the ignition off.
Measure the resistance of the (C18) A/C Pressure Signal circuit from
the A/C Pressure Transducer harness connector to the C1 FCM har-
ness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 5
No
>> Repair the open in the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
5.
(C18) A/C PRESSURE SIGNAL CIRCUIT SHORTED TO THE (T103) 5-VOLT SUPPLY CIRCUIT
Measure the resistance between the (C18) A/C Pressure Signal circuit
and the (T103) 5-volt Supply circuit in the A/C Pressure Transducer
harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Repair the short between the (T103) 5-volt Supply circuit
and the (C18) A/C Pressure Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 6
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 579
P0533-A/C PRESSURE SENSOR CIRCUIT HIGH (CONTINUED)
6.
(G180) SENSOR RETURN CIRCUIT OPEN
Disconnect the C3 FCM harness connector.
Measure the resistance of the (G180) Sensor Return circuit from the
A/C Pressure Sensor harness connector to the C3 FCM harness con-
nector.
Is the resistance below 5.0 ohms?
Yes
>> Go To 7
No
>> Repair the open in the (G180) Sensor Return circuit
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
7.
FRONT CONTROL MODULE
NOTE: Before continuing, check the FCM harness connector terminals for corrosion, damage, or terminal
push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and
Ground circuits.
Were there any problems found?
Yes
>> Repair as necessary.
Perform BODY VERIFICATION TEST-VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
No
>> Replace and program the Front Control Module per Service Information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL
MODULES/FRONT CONTROL MODULE - DIAGNOSIS AND TESTING)
9 - 580
ENGINE ELECTRICAL DIAGNOSTICS
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P0551-POWER STEERING PRESSURE SWITCH PERFORMANCE
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ENGINE ELECTRICAL DIAGNOSTICS
9 - 581
P0551-POWER STEERING PRESSURE SWITCH PERFORMANCE (CONTINUED)
For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
Theory of Operation
The power steering switch is used to enable quick spark and fuel corrections for high power steering loads to main-
tain target idle speed. The power steering switch rationality monitors the switch input during high vehicle speed
conditions when the steering wheel cannot be turned far enough to reach the high-pressure switch point. If the
power steering switch input remains at a high-pressure condition at high vehicle speeds, a failure timer will incre-
ment.
•
When Monitored:
With the ignition key on and engine running.
•
Set Condition:
With the vehicle above 40 mph for over 30 seconds, the power steering pressure switch remains open. Two
Trip Fault. Three good trips to turn off the MIL.
Possible Causes
(K66) P/S SWITCH SIGNAL CIRCUIT OPEN
(K66) P/S SWITCH SIGNAL CIRCUIT SHORTED TO GROUND
(Z988) GROUND CIRCUIT OPEN
POWER STEERING PRESSURE SWITCH
PCM
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
Diagnostic Test
1.
ACTIVE DTC
Ignition on, engine not running.
With a scan tool, read DTCs.
Is the DTC active at this time?
Yes
>> Go To 2
No
>> Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9 - 582
ENGINE ELECTRICAL DIAGNOSTICS
HB
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